Which of the following component is usually fabricated out of silicon steel ?
Bearings
Shaft
Stator Core
None of the above
Stator Core
The frame of an induction motor is usually made of
cast iron
bronze
aluminium
silicon steel
cast iron
In medium sized induction motors the slip is generally around
0.04
0.004
0.0004
0.14
0.04
Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ?
By injecting e.m.f. in the rotor circuit
By changing the number of stator poles
Rotor rheostat control
By operating two motors in cascade
By changing the number of stator poles
In case of the induction motors the torque is
directly proportional to slip
inversely proportional to (Vslip)
directly proportional to (slip)2
inversely proportional to slip
directly proportional to slip
A double squirrel-cage induction motor has
two series windings in stator
two parallel windings in stator
two rotors moving in oppsite direction
two parallel windings in rotor
two parallel windings in rotor
When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered
in series
in series-parallel
in parallel
in parallel with stator
in parallel
Stepless speed control of induction motor is possible by which of the following methods ?
Changing the number of poles
None of the above
Cascade operation
E.M.F. injection in rotor circuit
Changing the number of poles
The maximum torque in an induction motor depends on
all of the above
rotor inductive reactance
frequency
square of supply voltage
all of the above
The shaft of an induction motor is made of
any of the above
stiff
flexible
hollow
stiff
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